Field crew assembling lengths of transit pipe (by use of collars fitted with rubber rings) for the drainpipe on s-_. prior technique of joining lengths of transit pipe had required a hydraulic jack to pull the collars into place. the type of joint on this line required a special soap to lubricate the joint and it was then snapped together by hand. the man in the checked jacket was a company representative sent to assist in this new assembly technique. 19__.